CODEWITHSUNDEEP
gradlebuild-process
Kunal
Kunal

Reputation: 607

Gradle plugin task ordering

What I have?

  1. Java source file with Main class (MainApp)

  2. gradle build script

    apply plugin: 'application' mainClassName = "MainApp" sourceSets.main.java.srcDirs = ['.']

So when I do gradle run, it executes main method and everything works just perfectly.

C:\tmp\gradle-fun>gradle run
:compileJava
:processResources UP-TO-DATE
:classes
:run
Hello MainApp !!
BUILD SUCCESSFUL

What I want to do?

Now I was wondering about clean task (common build tasks) to clean the build directory before run task executes.

There is reason behind that, I want to make sure that every time gradle should compile the java files and all .class file should be refreshed (its some requirement)

What I have tried?

Added a wrapper task which executes clean task and run task in order.

apply plugin: 'application'
mainClassName = "MainApp"
sourceSets.main.java.srcDirs = ['.'] 
task exec(dependsOn: ['clean', 'run'])

So when I run gradle exec, it does it job properly. However I feel that its patch work when you have extra tasks just for ordering execution.

C:\tmp\gradle-fun>gradle run
:clean
:compileJava
:processResources UP-TO-DATE
:classes
:run
Hello MainApp !!
:exec
BUILD SUCCESSFUL

What I would like to know?

Is there any way to avoid writing wrapper task and do some Gradle magic to achieve the requirement?

Upvotes: 5

Views: 3958

Answers (2)

Mark Vieira
Mark Vieira

Reputation: 13486

Just have the run task depend on clean. This will ensure your project is cleaned before every run. If you want to be more specific in regards to your use case, you can simply clean the compileJava task.

run.dependsOn 'cleanCompileJava'

Edit: To avoid deleting your classes before the run add:

classes.mustRunAfter 'cleanCompileJava'

Upvotes: 5

Janito Vaqueiro Ferreira Filho
Janito Vaqueiro Ferreira Filho

Reputation: 5072

You could create your own task, with clean and run as dependencies:

task cleanRun(dependsOn: [clean, run])

Or, you could follow Mark Vieira's answer and change the wiring:

run.dependsOn 'clean'
classes.mustRunAfter 'clean'

The second line makes sure that it doesn't clean the compiled classes.

Hope this helps =)

Upvotes: 5

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